Made of food grade quality plastic, BPA free, please feel free to use it for daily drinking. With a capacity of 16 ounces, this mug will help keep you hydrated and is ideal for outdoor activities. Reacts with cold liquids, the cup changes from one vibrant color to another when the temperature drops. Color Change Troubleshooting – Cold weather conditions can affect the color change. Please allow the product to reach room temperature for the most effective color change. Suitable for gatherings, parties, barbecues, picnics, outdoor trips and weddings. A must have for home, restaurant, bar and pool. Qty over 10000 by Ocean. We will always be online.